In just seven years, YouTube has become the most rapidly growing force in human history. Where does it go from here?

For every minute that passes in real time, 60 hours of video are uploaded to YouTube.

You can turn that number over in your mind as much as you want; at no point will it stop being incredible. Sixty hours every minute. That's five months of video every hour. That's 10 years of video every day. More video is uploaded to YouTube every month than has been broadcast by the three big TV networks in the past 60 years. And the pace is accelerating: last year the rate was only 48 hours per minute. William Blake once wrote something about seeing...